It could just be that the real big bad is not him, but the one that’s locked in the cave.
Isn't he the one ML got the coin from. If he is then the old old lady always sitting on the chair is his mother, last they showed them reunited talking of leaving since they had all betrayed YFS unless unless if I mixed up characters.
Trust Chinese when they say siblings when they are not biologically related. Almost missed this one. Watched flowers in the attic where siblings fell in love.